Question is: Is 7<sqrt(n)<8 or Is 49 < n < 64?nitya20 wrote:Is 7<sqrt(n)<8?
1. n>50
2. n<60
OA: C
However, I disagree with the OA. I think it should be E as sqrt(n) could be negative.
I just wanted to make sure it wasn't just me.
(1) n > 50
If n = 60, then n lies between 49 and 64, so the answer to the question is "yes".
If n = 65, then n does not lie between 49 and 64, so the answer to the question is "no".
No definite answer; NOT sufficient.
(2) n < 60
If n = 59, then n lies between 49 and 64, so the answer to the question is "yes".
If n = 45, then n does not lie between 49 and 64, so the answer to the question is "no".
No definite answer; NOT sufficient.
Combining (1) and (2), 50 < n < 60, so the answer to the question is "yes"; SUFFICIENT.
The correct answer is C.
